first of many doc test corrections
first of many doc test corrections

amandersillinois/landlab,RondaStrauch/landlab,cmshobe/landlab,landlab/landlab,ManuSchmi88/landlab,SiccarPoint/landlab,amandersillinois/landlab,laijingtao/landlab,ManuSchmi88/landlab,RondaStrauch/landlab,ManuSchmi88/landlab,Carralex/landlab,csherwood-usgs/landlab,RondaStrauch/landlab,Carralex/landlab,SiccarPoint/landlab,cmshobe/landlab,csherwood-usgs/landlab,landlab/landlab,Carralex/landlab,laijingtao/landlab,landlab/landlab,cmshobe/landlab